hydraulic crusher

Abstract

To provide a hydraulic crusher allowing rotational controllability of a hydraulic crusher body to be improved.SOLUTION: A hydraulic crusher 10 is provided with: a pair of crusher arms 11; a crusher body 12 supporting the pair of crusher arms 11 in a freely openable / closable manner; a fixation bracket 13 rotatably connecting the crusher body 12 to an arm of an operating carriage; a hydraulic actuator 20 disposed on the crusher body 12, for opening / closing the pair of crusher arms 11; a hydraulic motor 30 having a rotation mechanism rotating the crusher body 12; an opening / closing hydraulic flow passage 21 connected from an operating carriage side to the hydraulic actuator 20; a rotational hydraulic flow passage 31 branching from the opening / closing hydraulic flow passage 21 and connected on the hydraulic motor 30; and rotational hydraulic flow passage opening / closing means 40 for sending hydraulic oil of an opening side flow passage 22 of the opening / closing hydraulic flow passage 21 to the hydraulic motor 30 when hydraulic flow between two points within the opening side flow passage 22 stops.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a swing mechanism for a hydraulic crusher. [Background technology]

[0002] Patent Document 1 discloses a hydraulic crusher that includes a crushing arm, a crusher body that supports the crushing arm so that it can be opened and closed, a fixing bracket that connects the crusher body to the arm of a work platform so that it can be rotated, a hydraulic actuator that is disposed on the crusher body and opens and closes the crushing arm, and a hydraulic motor that rotates the crusher body.

[0003] In the technology described in the same document, as shown in Figure 4 of the same document, when the hydraulic actuator that opens and closes the crushing arm is fully contracted, if the pressure oil in the hydraulic passage on the piston rod side rises to a predetermined pressure, the control valve of the branch circuit is switched to supply pressure oil to the rotation mechanism, causing the rotation mechanism to operate. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-27239 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the technology described in Patent Document 1 has a problem in that the hydraulic control of the swing speed and swing stop becomes very sensitive and poor in controllability because the pressurized high-pressure oil enters the swing mechanism. The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a hydraulic crusher that can improve the rotation controllability of the crusher body. [Means for solving the problem]

[0006] In order to solve the above problems, a hydraulic crusher according to one aspect of the present invention comprises a pair of crushing arms, a crusher body that supports the pair of crushing arms so that they can be opened and closed, a fixing bracket that rotatably connects the crusher body to an arm of a work carriage, a hydraulic actuator that is disposed on the crusher body and opens and closes the pair of crushing arms, a hydraulic motor that constitutes a rotation mechanism that rotates the crusher body, an opening and closing hydraulic flow path that is connected to the hydraulic actuator from the work carriage side, a rotation hydraulic flow path that branches off from the opening and closing hydraulic flow path and is connected to the hydraulic motor, and a rotation hydraulic flow path opening and closing means that, when the flow of pressure oil between two points in an open-side flow path of the opening and closing hydraulic flow path stops, sends pressure oil in the open-side flow path to the hydraulic motor.

[0007] In a hydraulic crusher according to one aspect of the present invention, when the flow of pressure oil between two points in the open-side passage of the opening / closing hydraulic passage stops, the pressure oil in the open-side passage is sent to the hydraulic motor of the swing mechanism. Therefore, the swing mechanism operates with pressure oil at the same pressure as the operating pressure of the opening / closing mechanism. In other words, the swing mechanism operates with pressure oil that is not pressurized, which improves the swing controllability of the crusher body.

[0008] Here, the hydraulic crusher according to one aspect of the present invention may have a pressure loss generating means provided between two points in the open-side flow path, and the swing hydraulic flow path opening and closing means may be configured to determine the halt state of the flow of pressure oil by detecting that the pressure loss generating means causes the pressure difference between the two points to fall below a predetermined value. Such a configuration allows the device to be configured using only simple hydraulic equipment, which is advantageous in terms of reducing costs.

[0009] In the hydraulic crusher according to one aspect of the present invention, the pressure loss generating means may be a speed increasing circuit, which is convenient for simplifying the device configuration, since the speed increasing circuit conventionally provided in hydraulic crushers also serves as the pressure loss generating means. [Effects of the Invention]

[0010] As described above, according to the present invention, it is possible to improve the controllability of the rotation of the hydraulic crusher body. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is an explanatory diagram illustrating an embodiment of a hydraulic crusher according to an aspect of the present invention. FIG. [Figure 2] 1 is a diagram showing the configuration of a hydraulic circuit in one embodiment of a hydraulic crusher according to one aspect of the present invention, in which the crushing arm is shown in a state where the opening and closing operation is stopped. [Figure 3] 1 is a diagram showing the configuration of a hydraulic circuit in one embodiment of a hydraulic crusher according to one aspect of the present invention, and shows a state immediately after the crushing arm starts to open. FIG. [Figure 4] 1 is a diagram showing the hydraulic circuit of an embodiment of a hydraulic crusher according to an aspect of the present invention, in which the crushing arm is in an opening operation state. [Figure 5] FIG. 1 is a diagram showing the hydraulic circuit of an embodiment of a hydraulic crusher according to an aspect of the present invention, in which the crushing arm is fully opened, i.e., the hydraulic actuator has reached the contraction stroke end and the swing mechanism is operating. [Figure 6] 1 is a diagram showing the hydraulic circuit of an embodiment of a hydraulic crusher according to an aspect of the present invention, in which the crushing arms are in a closing operation state. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the drawings are schematic. Therefore, it should be noted that the relationship between thickness and planar dimensions, ratios, etc. differ from the actual ones, and the drawings also include portions where the relationship and ratio of dimensions differ from each other. Furthermore, the embodiments described below are intended to exemplify devices and methods for embodying the technical ideas of the present invention, and the technical ideas of the present invention do not limit the materials, shapes, structures, arrangements, etc. of the components to the embodiments described below.

[0013] As shown in FIG. 1, the hydraulic crusher 10 of this embodiment includes a pair of crushing arms 11, a crusher body 12 that supports the pair of crushing arms 11 so that they can be opened and closed, a fixed bracket 13 that connects the crusher body 12 to the arm of a work platform so that the crusher body 12 can be rotated, a hydraulic actuator 20 that is disposed on the crusher body 13 and opens and closes the pair of crushing arms 11, and a rotation hydraulic motor 30 that constitutes a rotation mechanism that rotates the crusher body 12.

[0014] As shown in FIG. 2, the hydraulic circuit that drives the hydraulic crusher 10 of this embodiment includes a pump P and a tank T provided on the side of the work platform (not shown), an opening / closing hydraulic flow path 21 for operating the hydraulic actuator 20, and a swing hydraulic flow path 31 for operating the swing hydraulic motor 30.

[0015] The opening / closing hydraulic flow path 21 has an opening side flow path 22 connected to the rod side of the hydraulic actuator 20 and a closing side flow path 23 connected to the tube side of the hydraulic actuator 20, and each of the flow paths 22, 23 is connected to a pump P and a tank T via an operation changeover valve 24. The swing hydraulic flow path 31 has an operating side flow path 32 and a return side flow path, and the operating side flow path 32 branches off from the opening side flow path 22 and the return side flow path 33 is connected to the closing side flow path 23.

[0016] The opening / closing hydraulic flow path 21 is provided with a known speed-up circuit 25. This speed-up circuit 25 constitutes the "pressure loss generating means" described in the means for solving the above problem. In this embodiment, an upstream branch point 26 is formed in the open-side flow path 22 upstream of the location where the speed-increasing circuit 25 is disposed, and a pilot flow path 35a (described later) is connected to the upstream branch point 26. Further, a downstream branch point 27 is formed in the open-side flow path 22 downstream of the location where the speed-increasing circuit 25 is disposed, and a pilot flow path 35b (described later) is connected to the downstream branch point 27.

[0017] In the swing hydraulic flow path 31, an opening / closing valve 34 is provided in the operating side flow path 32. A pilot port 34a of the on-off valve 34 is connected to the upstream branch point 26 via a pilot flow path 35a. A pilot port 34b of the on-off valve 34 is connected to the downstream branch point 27 via a pilot flow path 35b. A control valve 36 is provided in the pilot flow path 35b. A check valve 37 is provided in the actuation side flow path 32 upstream of the on-off valve 34, and a flow rate adjustment valve 38 is provided downstream of the on-off valve 34.

[0018] The on-off valve 34 is normally switched to the open position by the biasing force F1 of a spring, and is switched to the closed position when the differential pressure of the pilot pressures supplied to the pilot ports 34a, 34b, i.e., the pressure difference (P1-P2) between the pressure P1 at the upstream branch point 26 and the pressure P2 at the downstream branch point 27, exceeds F1. The biasing force F2 of the built-in spring of the check valve 37 is set to be larger than F1. The on-off valve 34, pilot flow path 35a, pilot flow path 35b, control valve 36, check valve 37 and flow rate adjustment valve 38, all of which are indicated by the reference numeral 40 in the figure, constitute the "swing hydraulic flow path on-off means" described in the means for solving the above problem.

[0019] Next, the operation and effects of the hydraulic crusher 10 of this embodiment will be described. 2, the motion changeover valve 24 is in a neutral position, and pressure oil is not supplied to the swing hydraulic flow path 21 and the swing hydraulic flow path 31. Therefore, the hydraulic actuator 20 and the swing hydraulic motor 30 do not operate.

[0020] 3 shows the state immediately after the operation changeover valve 24 is switched to the opening side of the crushing arm 11. At this time, the pressure difference (P1-P2) is smaller than the biasing force F1, so the on-off valve 34 maintains the open position, but because the pressure P1 is smaller than the biasing force F2, the pressure oil does not pass through the check valve 37 and the swing hydraulic motor 30 does not operate.

[0021] 4 shows the state of the opening operation of the crushing arm 11. At this time, the pressure difference (P1-P2) becomes larger than the biasing force F1, and the on-off valve 34 is switched to the closed position. Because the pressure P1 is larger than the biasing force F2, the on-off valve 34 is closed and no pressure oil is supplied, so the swing hydraulic motor 30 does not operate, even though the pressure difference (P1-P2) becomes larger than the biasing force F1 and the on-off valve 34 is switched to the closed position.

[0022] 5 shows the state where the crushing arm 11 is fully opened. At this time, the pressure difference (P1-P2) becomes zero and is smaller than the biasing force F1, so the on-off valve 34 is switched to the open position. Because the pressure P1 is greater than the biasing force F2, the pressurized oil passes through the check valve 37 and is supplied to the hydraulic motor 30 for rotation, causing the crusher body 12 to rotate. The pressure of the pressurized oil supplied to the hydraulic motor 30 for rotation is not increased. Therefore, the operating speed and stopping of the rotation operation can be easily controlled by the flow rate adjustment valve 38.

[0023] 6 shows the closing operation of the crushing arm 11, i.e., the state during crushing work. At this time, the pressure difference (P1-P2) of the pressurized oil sent from the hydraulic actuator 20 to the tank T via the open-side flow path 22 is smaller than the biasing force F1. Therefore, the on-off valve 34 maintains the open position, but because the pressure P1 is smaller than the biasing force F2, the pressurized oil does not pass through the check valve 37 and the swing hydraulic motor 30 does not operate.

[0024] As described above, the hydraulic crusher 10 of this embodiment can improve the rotation controllability of the crusher body 12. The hydraulic crusher according to the present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention.

[0025] For example, a flow meter may be provided as a means for detecting the halt of the flow of pressurized oil between two points in the open-side flow path of the opening / closing hydraulic flow path, and the detection signal may be used to operate the swing hydraulic flow path opening / closing means, which sends pressurized oil in the open-side flow path to the hydraulic motor. The pressure loss generating means provided between two points in the open-side flow path may be a pressure booster circuit (see Japanese Patent Application Laid-Open No. 7-248003 for details). Furthermore, the pressure loss generating means provided between two points in the open-side flow path may be a throttle valve, or simply piping resistance may be used as long as it generates an appropriate pressure difference. [Explanation of symbols]

[0026] 10 Hydraulic crusher 11 Crushing Arm 12 Crusher body 13 Fixing bracket 20 Hydraulic Actuator 21 Hydraulic flow path for opening and closing 22 Open side flow path 23 Closed side flow path 24 Operation switching valve 25 Speed ​​increasing circuit (pressure loss generating means) 26 Upstream branch point 27 Downstream Branch 30 Swing hydraulic motor 31 Swing hydraulic flow path 32 Working side flow path 33 Return flow path 34 On-off valve 34a, 34b pilot ports 35a, 35b Pilot flow path 36 Control valve 37 Check valve 38 Flow control valve 40 Swing hydraulic flow path opening and closing means P pump T Tank

Claims

1. A pair of crushing arms; a crusher body that supports the pair of crushing arms so that they can be opened and closed; a fixing bracket for connecting the crusher body to an arm of a work platform in a rotatable manner; a hydraulic actuator disposed in the crusher body for opening and closing the pair of crushing arms; a hydraulic motor constituting a rotation mechanism for rotating the crusher body; an opening / closing hydraulic flow path connected to the hydraulic actuator from the work platform side; a swing hydraulic flow path branching from an open-side flow path of the opening / closing hydraulic flow path and connected to the hydraulic motor; and a swing hydraulic flow path opening / closing means for sending pressure oil in the open-side flow path to the hydraulic motor when the flow of pressure oil between two points in the open-side flow path stops, The swing hydraulic flow path opening / closing means includes an opening / closing valve and a check valve, the on-off valve is in communication while the flow of pressure oil between the two points in the open-side flow path is stopped, The check valve is opened when a predetermined hydraulic pressure is applied from the upstream side of the check valve. The hydraulic crusher is characterized in that the predetermined hydraulic oil pressure is set to a pressure higher than the hydraulic oil pressure when the crushing arm is closed and lower than the hydraulic oil pressure when the crushing arm is opened, near the branch point of the open-side flow path and the swing hydraulic flow path.

2. a pressure loss generating means provided between two points in the open-side flow path, 2. The hydraulic crusher according to claim 1, wherein the swing hydraulic flow path opening and closing means determines a state in which the flow of pressure oil has stopped by detecting that the pressure difference of the pressure oil between the two points caused by the pressure loss generating means is equal to or less than a predetermined value.

3. 3. A hydraulic crusher according to claim 2, wherein the pressure loss generating means is a speed increasing circuit.

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